I think the best answer is 'it creates a mood of despair and surrender', but it could possibly be 'it suggests what the characters should be feeling'.
The power of Boadicea is highlighted in this excerpt, using adjectives such as fierce, beautiful, and the imagery of "her golden hair blowing round her in the wind" giving the illusion of someone otherworldly, superior to common beings. Her speech rouses deep passion in the people, it's a call for action that is responded eagerly. Loyalty to the Queen is loyalty to the Country, the soldiers pledge their lives to her, hence they pledge their lives to fight for the country against the Romans. Her rage is mirrored and multiplied, till everybody is willing to die for her, to avenge their country.
Answer:
An argument relies on a comparison of two things
Explanation:
Many arguments rely on an analogy between two or more objects, ideas, or situations. If the two things that are being compared aren’t really alike in the relevant respects, the analogy is a weak one, and the argument that relies on it commits the fallacy of weak analogy.
Analogy: a comparison between two things, typically for the purpose of explanation or clarification.